<!DOCTYPE html>
<html>
    <style>
        #foo {
            font-style: oblique calc(sign(1em - 1px) * 1rad);
        }
    </style>
    <div id="foo"></div>
    <script src="../include.js"></script>
    <script>
        test(() => {
            println(getComputedStyle(foo).fontStyle);
        });
    </script>
</html>
